preparation

Preheat oven to 400°F.

Cook onion and garlic in oil in a 12-inch nonstick skillet over moderate heat, stirring, until onion is softened, about 2 minutes. Add carrot and cook, stirring, until softened, about 3 minutes. Add mushrooms, 1/2 teaspoon salt, and 1/4 teaspoon pepper and cook, stirring occasionally, until liquid mushrooms give off is evaporated and they are very tender, 10 to 15 minutes. Stir in Worcestershire sauce, parsley, and 3 tablespoons ketchup, then transfer vegetables to a large bowl and cool.

Stir together bread crumbs and milk in a small bowl and let stand 5 minutes. Stir in egg and egg white, then add to vegetables. Add turkey and remaining 1/2 teaspoon salt and 1/4 teaspoon pepper to vegetable mixture and mix well with your hands. (Mixture will be very moist.)

Form into a 9- by 5-inch oval loaf in a lightly oiled 13- by 9- by 2-inch metal baking pan and brush meatloaf evenly with remaining 2 tablespoons ketchup. Bake in middle of oven until thermometer inserted into meatloaf registers 170°F, 50 to 55 minutes.